After a talk with his mother, the little boy has seen to _____ that the same mistake doesn’t happen again．
A．one B．it C．him D．himself
To his disappointment, not a single gift _____ on his birthday．
A．he received B．had he received
C．did he receive D．received he
Most Australians actually don’t seem to do much sport．_____, Australia is generally considered to be a great sporting nation．
A．Though B．Still C．Otherwise D．Thus
Professor Smith will come here to give a speech．All the preparations must be _____ before 5 o’clock．
A．in time B．in sight C．in place D．in control
---Is everything settled?
---Not yet．_____ I approached the problem, I couldn’t find a solution．
A．Whatever B．However C．Whenever D．Wherever
The retired professor, _____ in his new book in the past three years, hasn’t realized the decline in his health．
A．involved B．being involved
C．having involved D．to be involved
